8" x 1" BENCH GRINDING WHEEL 100 grit Vitrified 1" Arbor includes 3/4" 5/8" 1/2" Bushing Abrasive : Aluminum Oxide Dimension: 8" dia x 1" width Bore : 1" includes 3/4" 5/8" 1/2" Bushing Grade Code : 100 Grit Bond : Vitrified